CVE-2026-6550: Key commitment policy bypass via shared key cache in AWS Encryption SDK for Python

Key commitment policy bypass via shared key cache in AWS Encryption SDK for Python

F-AWS-ENCRYPTION-SDK-PYTHON-001

Public snapshot: 26 Sep 2026. Status, releases and attribution belong to each source below; none is inferred from another record.

Recorded evidence

4.7medium

CVE-2026-6550CVEaws/aws-encryption-sdk-python

Key commitment policy bypass via shared key cache in AWS Encryption SDK for Python

Fixed in: 3.3.1, 4.0.5

patched

details

Finding IDs: F-AWS-ENCRYPTION-SDK-PYTHON-001
CVE: CVE-2026-6550
GHSA: GHSA-v638-38fc-rhfv
Status: patched
Fixed in: 3.3.1, 4.0.5
Recorded credit: acknowledgement: 1seal.org
Note: GHSA-v638-38fc-rhfv · AWS-2026-017
CVSS vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
CVE registry state: PUBLISHED
CVE state checked: 23 Sep 2026
CVSS assessment: AMZN CNA; v3.1; 4.7; observed 2026-09-24
Upstream title: Key commitment policy bypass via shared key cache in AWS Encryption SDK for Python
Upstream publication: 20 Apr 2026
Upstream updated: 20 Apr 2026
Metadata fetched: 23 Sep 2026
Upstream @1seal credit: No structured @1seal credit in this snapshot; textual acknowledgements may exist.

F-AWS-ENCRYPTION-SDK-PYTHON-001: Verification failures. Cached key material bypasses a required key-commitment check. Reviewed 24 Sep 2026. Mechanism assessed by 1seal.

Mechanism source for F-AWS-ENCRYPTION-SDK-PYTHON-001

Security area (1seal assessment): Integrity. Shared cached encryption materials can bypass key commitment, undermining the binding between ciphertext and plaintext. Reviewed 21 Sep 2026.

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